Spectroscopy
In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the

the Fourier Transfer Algorithm allows us to scan all frequencies at once
light is faster today that it used to be
absence of broad spectrum of wavelenth
None of these

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Spectroscopy
Vibrational spectroscopy is

an Infrared spectroscopy
a class of spectroscopic techniques which analyzes molecular motions
a flashlight through a prism and shake it
a large mass on a weak spring

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